the fbi, police and the coast guard are at the belle haven marina in alexandria, and we're told an armed man is there on a boat. ken molestina is there as well. ken, what can you tell us? >> reporter: well, derek, this is something that's been going on for the better part of four hours, now. as you mentioned, there is a man on the sail boat. he's anchored off of the docks. he's refused to surrender. he fired up to four shots possibly at a nearby helicopter that was hovering over the area. let's go ahead and show you some video what it looked like earlier today. again, a big police scene out here. we understand officers from fairfax, police department responded as well as dc police, the coast guard and even the fbi. the witnesses say this man fired, once again, at a helicopter. there was a helicopter in the area. witnesses do say that they saw that. then they heard the gunshots soon after the police came and the man then returned back to the sail boat that was anchored off of the docks. the man we don't know exactly who he is. police aren't saying a whole lot. but take a listen to what on